import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = sc.nextInt();
    	int ans = 0;
    	int xOne = 0;
    	int xTwo = 0;
    	for (int i = 0; i < n; i++) {
    	    int x = sc.nextInt();
    	    if (x == 1) {
    	        xOne++;
    	    } else if (x == 2) {
    	        xTwo++;
    	        ans += n;
    	    }
    	}
    	int yOne = 0;
    	int yTwo = 0;
    	for (int i = 0; i < n; i++) {
    	    int x = sc.nextInt();
    	    if (x == 1) {
    	        yOne++;
    	    } else if (x == 2) {
    	        yTwo++;
    	        ans += n - xTwo;
    	    }
    	}
    	if (xTwo == 0 && yTwo == 0) {
    	    ans += Math.max(xOne, yOne);
    	} else if (xTwo == 0) {
    	    ans += yOne;
    	} else if (yTwo == 0) {
    	    ans += xOne;
    	}
    	System.out.println(ans);
	}
}